BMW Questions? Ask a BMW Repair Expert for Answers.
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.unfortunately this is usually caused by a failed amplifier which will require it be replaced.
you should check fuses if you have not, they are on the underside of the passenger dashboard and also in the trunk behind the right side trim panel per this info: https://app.box.com/s/urmlzm4u4rdzy87g3pk6ype3h1ff84vh.
if you need a good shop to save $ vs the dealer check out www.bimmershops.com or www.bimrs.org for options
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